Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7acdb82414fc6b…

MALICIOUS

PDF

111.4 KB Created: 2021-03-18 19:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43657545c7e7aed34af55f63bbb77b2e SHA-1: a90c5369b8f588d297b98be62af8a8b69d51245a SHA-256: 4d7acdb82414fc6b9f78eb9c54af272eab913fae360c316523c9df230d881219
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The primary heuristic identified a large link farm within the PDF, pointing to numerous external URLs, many hosted on disposable domains. This suggests the document's purpose is to manipulate search engine results or redirect users to potentially harmful content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=bass+guitar+fretboard+notes+printable PDF link annotation
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/gizor.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/7731230.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/93ceade3aabc.pdfIn PDF document text
    • https://lizimiligamib.weebly.com/uploads/1/3/4/5/134584059/gitebitujut_damidavamefon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5feb9ff789dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5fd8f388cc822.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/267e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_601559ee8e84f.pdfIn PDF document text
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/xobadazufusepasob.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/0cd58f03.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae616f5-8273-4680-803a-5c6542c536e7/gevopajilenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfe8ea8-dffb-4b75-9bbe-b95305ce9697/how_often_should_breastfed_baby_poop_after_starting_solids.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_4c02b1d2ba7e43c086c3d6c37689bcf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62377080-64b2-4c30-b312-a518b22ced6f/9045784810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7568c39b-0475-44d4-bc0b-fac0311d16f2/4965437811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4236d1a2-68b5-4909-ac94-50ebce32e279/the_innovators_solution_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc61096a-8f86-47ac-b457-7bd6412938da/wesawetewosoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f22fff-e275-4d24-a231-4d64478d3cfb/88958010847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f64bb63-618c-49df-a7af-e014949c0502/el_poder_del_metabolismo_gratis_descargar.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_fe24c437ed844180b0908db9eb3e0014.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf6741d-284e-4442-9c73-b4c2e8454328/philosophy_of_science_journal_submission.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012d3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D3A 8572 bytes
SHA-256: 386f9bfb8cf1a981e5ad30313d8799dd39c8cb77747abb3dba34ab31b31fd7e4
stream_006_off000175d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x175D5 24996 bytes
SHA-256: 249b42f9fe1434d1ea69c3752635b7b6c801b8fc9852b924e5ec988c810df687
font_00_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 10704 bytes
SHA-256: e5355b0a5e341017b2c9a9914c29a5a332f2694479566dc2b6ef56a63c0da3c1
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 5396 bytes
SHA-256: 67c49bb058864792a35c913e5cc4adcea727b27e386992acd4a638fc84c706e5
font_03_sfnt_off00014528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14528 15764 bytes
SHA-256: 2b8d93c99f20b1abb8906c7be6a2cf157dd95701b22b9afc3cb39bb38d1469d2
font_05_sfnt_off0001a1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C2 3164 bytes
SHA-256: bbe295b6a92780ae5a90d35105458c18002fa42ccef4532c27a1877840e9e3ca

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